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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Discrete income tax expense (benefit)	$ 2,887	$ (4,428)	$ (17,794)	$ (31,895)

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- Definition

Discrete Income Tax Expense (Benefit)

+ References

No definition available.

+ Details

Name:	bsy_DiscreteIncomeTaxExpenseBenefit
Namespace Prefix:	bsy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration